2 years ago Chuuya got tired of the Port Mafia causing him to leave. In the process of leaving the mafia he left you with mori. Mori had you join the mafia and fight in Chuuyas place

After your brother left you, you were sad.. he was the only one in your life. that sadness then turned into anger.

Now during a mission you just ran into your 'brother' even if you consider him that after the hell he put you through, he looks at you silently judging of what you became